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INSTALLATION MANUAL
TECHNOLOGY
VC75 OPTIMATCH STEREO VOLUME CONTROL
Attenuator type: Tapped auto transformer.
Switch: 12 position rotary, make-before-break contacts, low torque specifications for
smooth feel.
Connector: Screw-tight type, or removable.
Power rating: Complies with UL 1492 @ 25 Watts RMS continuous, 35Hz- 20 KHz, 75 Watts
Audio.
Core Saturation: Studies reveal that transformer core saturation @ 35 Hz is 25 Watts.
Transformers: Tri-filar wound for flat response and minimum phase shift, grain-oriented,
-34 dB in 12 steps, 8 steps @ -3 dB each, 1 step@4dB,1step@-6dB,
last step OFF.
Mounting: Fits most standard single gang junction boxes.
OPTIMATCH(tm): Will match impedance for almost any situation. Mechanical index permits
presetting load impedance multiplication by X2, X4, X8, X16, X32, X64, etc.,
which can be changed at any time.
Installation must be made by qualified service personnel, and must meet all local codes.
OPTIMATCH(tm) is a new concept in self-impedance matching controls. It can be used either as a full range volume control, or
as an impedance matching volume control that can be adjusted to meet the requirements of your installation. One simple adjustment can be
made when the control is connected, and can be changed to accommodate additions to the installation at any time. It is easily retrofitted to
almost any existing system.
TM
SPECIFICATIONS
INSTALLATION
Listed
Audio Equipment
P11 CCC 2
94V 0
1. Make connections by stripping the wire insulation back about 3/16". Twist any loose strands tightly.
2. Insert the wires from the amplifier into the INPUT openings of the connector, hot to hot and ground to
ground, then tighten the screws. Check for any loose strands that might cause a short circuit. Make
sure the metal part of the screw connector engages the bare wire, NOT the insulation.
3. Similarly, connect speaker wires to the control OUTPUT openings and tighten screws.
4. If using the impedance matching feature of the OPTIMATCH(tm) control, set the index following the chart
below. To set, remove knob and loosen nut to reposition index. Make sure index is not between detent
positions and tighten.
5. Install the control in its operating location. (SUGGESTION: Leave control 3 or 4 positions CCW from
maximum before firing up the system for the first time to avoid "blasting" the speakers, while still having
enough sound to observe operation.
X128
(STEP 5)
X256
(STEP 4)
X512
(STEP 3)
IMPEDANCE MULTIPLES
X64
(STEP 6)
X1024
(STEP 2)
X32
(STEP 7)
OFF
(STEP 1)
#4 Ohm
Speakers
X16
(STEP 8)
X8
(STEP 9)
DEFAULT
X4
(STEP 10)
X2
(STEP 11)
FULL
ON
(STEP 12)
We do not recommend wiring more than 12 Optimatch(tm) controls in parallel (NOTE: Do not
run more than (2)-8 Ohm speakers per channel). In these instances more impedance protection
should be inserted before the volume controls. The OC-12 is a good choice in this case.
FACTORY
SETTING
Per Channel
2
3
4
5
6
#8 Ohm
Speakers
Per Channel
2
3
4
5
6
7
8
9
10
11
12
Load
(Ohms)
4.0000
2.6667
2.0000
1.6000
1.3333
1.1429
1.0000
0.8889
0.8000
0.7273
0.6667
Tap Setting
For Matchit(tm)
X2
X4
X4
X8
X8
X8
X8
X16
X16
X16
X16
No. of Available
Steps for
Optimatch(tm) Controls
11
10
10
9
9
9
9
8
8
8
8
2006 - 3/3/06
revised 8/10/2011
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WARRANTY
Your AUDIOPLEX TECHNOLOGY Stereo Speaker Volume Control is covered by a Lifetime warranty against
any defects in workmanship and materials. Any defects will be remedied without charge for labor or parts.
Damage incurred by shipping or accident is not considered to be a defect, and not covered by this warranty.
AUDIOPLEX TECHNOLOGY is not responsible for defective operation caused by abuse or by modification or service by
any unauthorized person or agency.
The product must be properly installed and operated according to instructions for the warranty to apply. Any
necessary servicing must be done by AUDIOPLEX TECHNOLOGY. The product must be returned expenses prepaid, with
written authorization from the company. The product must be shipped with the proof of purchase and in the original carton
and packing material to avoid damage. This warranty gives you specific legal rights. you may have other rights which vary
from state to state.
WIRING DIAGRAM
AMPLIFIER
+L-
SPEAKER OUTPUT
-R+
+L-
-R+
L
E
B
M
O
R
P
?
S
N
1-800-257-2077
O
I
TOLL-FREE
T
S
E
U
CALL
Q
S
?
N
E
E
D
H
E
L
P
?
OUTPUT
L+
VOLUME CONTROL
(BACK VIEW)
INPUT
L+R+ R+L- L-R- R-
2006 - 3/3/06
AUDIOPLEX TECHNOLOGY
1-800-257-2077 1-603-544-8601 FAX: 1-603-544-8901
404 GWH P.O. BOX 440
MELVIN VILLAGE, N.H. 03850
E-MAIL: sales@audioplex.com
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